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TEA1097 Datasheet(PDF) 2 Page - NXP Semiconductors |
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TEA1097 Datasheet(HTML) 2 Page - NXP Semiconductors |
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2 / 36 page  1999 Apr 08 2 Philips Semiconductors Product specification Speech and loudspeaker amplifier IC with auxiliary inputs/outputs and analog multiplexer TEA1097 FEATURES Line interface • Low DC line voltage • Voltage regulator with adjustable DC voltage • Symmetrical high-impedance inputs (70 kΩ) for dynamic, magnetic or electric microphones • Dual Tone Multi-Frequency (DTMF) input with confidence tone on earphone and/or loudspeaker • Receive amplifier for dynamic, magnetic or piezo-electric earpieces (with externally adjustable gain) • Automatic Gain Control (AGC) for true line loss compensation. Supplies • Provides a strong 3.35 V regulated supply for microcontroller or dialler • Provides filtered power supply, optimized according to line current and compatible with external voltage or current sources • Filtered 2 V power supply output for electret microphone • Compatible with a ringer mode • Power-Down (PD) logic input for power-down. Loudspeaker amplifier • Single-ended rail-to-rail output • Externally adjustable gain • Dynamic limiter to prevent distortion • Logarithmic volume control via linear potentiometer. Auxiliary interfaces • Asymmetrical high-impedance input for electret microphone. • General purpose auxiliary output for transmit and receive • Auxiliary transmit input with high signal level capability dedicated to line transmission • Auxiliary receive input with high signal level capability • Integrated multiplexer for channels selection. APPLICATIONS • Telephone answering machines • Telephones with digital handsfree • Line powered telephone sets • Cordless telephones • Fax machines. GENERAL DESCRIPTION The TEA1097 is an analog bipolar circuit dedicated for telephone applications. It includes a line interface, handset microphone and earpiece amplifiers, base microphone and loudspeaker amplifiers, some specific auxiliary Inputs/Outputs (I/Os) and an analog multiplexer to enable the right transmit and/or receive channels. The multiplexer is controlled by a logic circuitry decoding four logic inputs provided by a microcontroller. Twelve different application modes have been defined and can be accessed by selecting the right logic inputs. This IC can be supplied by the line and/or by the mains if available (in a cordless telephone or a telephone answering machine for example). It provides a 3.35 V supply for a microcontroller or dialler and a 2 V filtered voltage supply for electret microphones. The IC is designed to facilitate the use of the loudspeaker amplifier during ringing phase. ORDERING INFORMATION TYPE NUMBER PACKAGE NAME DESCRIPTION VERSION TEA1097TV VSO40 plastic very small outline package; 40 leads SOT158-1 TEA1097H QFP44 plastic quad flat package; 44 leads (lead length 1.3 mm); body 10 × 10 × 1.75 mm SOT307-2 |
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